High-frequency systems (i.e. 2.4 GHz and higher) that use linear polarization, typically require a clear line-of-sight path between the two points in order to operate effectively. Such systems have difficulty penetrating obstructions due to reflected signals, which weaken the propagating signal. Reflected linear signals return to the propagating antenna in the opposite phase, thereby weakening the propagating signal. Conversely, circular-polarized systems also incur reflected signals, but the reflected signal is returned in the opposite orientation (Left Hand Circular Polarized or Right Hand Circular Polarized), largely avoiding conflict with the propagating signal. The result is that circularly-polarized signals are much better at penetrating and bending around obstructions.

Multi-path is caused when the primary signal and the reflected signal reach a receiver at nearly the same time. This creates an “out of phase” problem. The receiving radio must then spend its resources to distinguish, sort out, and process the proper signal, thus degrading performance and speed. Linear Polarized antennas are more susceptible to multi-path due to increased possibility of reflection. Out of phase radios can cause dead-spots, decreased throughput, distance issues and reduce overall performance.

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